Characterization of cold-sprayed nanostructured Fe-based alloy

Wen Ya Li, Chang Jiu Li

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The ball-milled Fe-Si alloy was used as feedstock for deposition of nanocrystalline Fe-Si by cold spraying process. The microstructure of the as-sprayed nanostructured Fe-Si was characterized by using optical microscopy, scanning electron microscopy and transmission electron microscopy. The grain sizes of the feedstock and as-sprayed deposit were estimated based on X-ray diffraction analysis. The microhardness and coercivity of the deposited Fe-Si alloy were characterized. The results showed that the as-sprayed deposit presented a dense microstructure. The mean grain size of the as-deposited Fe-Si was several tens nanometers and comparable to that of the corresponding milled feedstock. The temperature of driving gas presented little effect on the microstructure of cold-sprayed nanostructured Fe-Si deposit. The mechanical alloying induced oxygen contents up to 8 wt% in the feedstocks and subsequent deposits. The microhardness of the deposit reached about 400 Hv. The deposit achieved a high coercivity up to 190 kA/m indicating the potential possibility for applications to recording materials.

Original languageEnglish
Pages (from-to)2193-2198
Number of pages6
JournalApplied Surface Science
Volume256
Issue number7
DOIs
StatePublished - 15 Jan 2010

Keywords

  • Coercivity
  • Cold spraying
  • Fe-Si coating
  • Mechanical milling
  • Microhardness
  • Nanostructure

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